Problem reading ground traffic data

[ranathane]

Using the FSUIPC Hello vb program in the SDK, I don't seem to have any problems reading any other positions but when i try to read the E000 ranges (i.e. E004 = number used slots) it only returns zero. The code is just added into the existing program after the timer loop:

Dim dwResult As Long

Dim NumGndTfc As Long

If FSUIPC_Read(&HE004, 2, VarPtr(NumGndTfc), dwResult) Then

If FSUIPC_Process(dwResult) Then

frmMain.lblGroundTraffic.Caption = NumGndTfc & " X"

Else

' Unable to "Process"

frmMain.lblGroundTraffic.Caption = "Processing: " & ResultText(dwResult)

End If

Else

' Unable to "Read"

frmMain.lblGroundTraffic.Caption = "Reading: " & ResultText(dwResult)

End If

Now in FSInterrogate it pulls the right data so I know i'm doing something wrong.

Using FS2K2 and FSUIPC 3.47

Thanks!

[Pete Dowson]

Apologies for the delay in my reply -- as announced in this Forum I've been away with no Internet access from 24th September until 12th October.

If FSUIPC_Read(&HE004, 2, VarPtr(NumGndTfc), dwResult)

Try using the Logging provided in FSUIPC. If you enable IPC read logging you will probably see that your VB code actually tries to read offset &FFFFE004 (masked to 1FE004 probably). The stupid VB compiler sign-extends everything with a top bit set. Even stating &0000E004 doesn't appear to work. I think you have to postpend another & to stop this, i.e. &E004&.

Using FS2K2 and FSUIPC 3.47

Please always use the latest version -- 3.47 is well out of date.

Regards,

Pete